US3915753A - Liquid indicator for a storage battery with a flame barrier vent filter - Google Patents

Liquid indicator for a storage battery with a flame barrier vent filter Download PDF

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Publication number
US3915753A
US3915753A US452081A US45208174A US3915753A US 3915753 A US3915753 A US 3915753A US 452081 A US452081 A US 452081A US 45208174 A US45208174 A US 45208174A US 3915753 A US3915753 A US 3915753A
Authority
US
United States
Prior art keywords
rod
cap
bore
liquid level
level indicator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US452081A
Other languages
English (en)
Inventor
Robert Richard Melone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to US452081A priority Critical patent/US3915753A/en
Priority to CA221,760A priority patent/CA1033227A/en
Priority to IT21272/75A priority patent/IT1034283B/it
Priority to DE2511426A priority patent/DE2511426C2/de
Priority to FR7508296A priority patent/FR2265070B3/fr
Priority to SE7502970A priority patent/SE410540B/xx
Priority to JP50031930A priority patent/JPS5818608B2/ja
Application granted granted Critical
Publication of US3915753A publication Critical patent/US3915753A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/383—Flame arresting or ignition-preventing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/484—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring electrolyte level, electrolyte density or electrolyte conductivity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/308—Detachable arrangements, e.g. detachable vent plugs or plug systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/394—Gas-pervious parts or elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • ABSTRACT A liquid level indicator made of a transparent rod with an upper viewing surface and a lower reflective surface and a battery cap that surrounds the upper portion of the rod is disclosed.
  • the upper portion of the rod carries a large diameter rim having a gas passageway formed thereon and a small diameter rim with a baffle plate disposed above the gas passageway.
  • cap has a circular opening that surrounds the top of the rod and a lower circular channel which allows for the venting of battery gas upwardly through the circular opening.
  • a porous filter constructed of a material having a low heat conductivity, such as polyvinyl flouride, is retained in place in the opening by a pair of resilient beads on the cap.
  • Battery vent plugs for battery caps not comprising indicator members have been formed utilizing sintered silicon carbide. While silicon carbide provides a flame barrier structure, it is a very hard material which fractures easily; and the hardness of the silicon carbide causes a large number of manufacturing problems. In addition, silicon carbide is a very good conductor of heat and if a flame is ignited, heat conducted from the filter to the battery cap, which is generally formed of plastic, melts the cap in a very short time.
  • the object of the present invention to provide a porous flame barrier filter for a battery cap and a liquid level indicator assembly in which the filter is formed of a material that has a relatively low heat conductivity.
  • FIG. 1 is a perspective view of a combined liquid level indicator and hydrometer and battery cap assembly that has a filter constructed in accordance with the present invention
  • FIG. 2 is a partial cross-sectional showing of the interior of the cap structure of FIG. 1, and the external portion of the rod that is surrounded by the cap and the hydrometer cage with one of the two sections that make up the cage being removed.
  • the indicator consists of an elongated transparent rod which may be formed of a transparent platic material such as styrene acrylonitrile, which receives incident light rays 12 which are transmitted down the rod to a lower reflecting surface 14, which in the present embodiment takes the form of a conical surface having an included angle of 90.
  • the light rays 12 are reflected from one portion of the surface horizontally across to an opposite portion of the surface and then returned upwardly to the viewing surface 16 at the top of the rod 10, when the rod 10 is not immersed in a liquid.
  • reflection is thereby prevented.
  • the rod indicator 10 may be combined with a hydrometer in a manner shown in Ryder U.S. Pat. No. 3,597,973.
  • the hydrometer cage 18 is secured to the lower end of the rod 10 so that the reflecting surface 14 projects into the opening 20 in the hydrometer cage 18.
  • the hydrometer cage 18 may be formed in two housing sections 21,22 which are ultrasonically welded together by means of the male projections 24,26 on the cage section 22, which extend into corresponding female apertures in the other cage section 21.
  • the apertures 28,30 receive male holding pins from the cage section 22.
  • the hydrometer cage 18 is preferably formed of a plastic material such as styrene acrylonitrile having a filler material which gives it a black color so that it is not transparent.
  • the lower end of the rod 10 is formed with a rib 32 which fits into a corresponding recess 34 in the housing section 21,22.
  • a small ball of an appropriate specific gravity may be formed of a material such as silicone rubber, which is preferably colored a bright color such as green or orange and is retained by the cage 18.
  • the ball 36 is restrained by the sections 21,22 to travel along two paths defined generally by the apertures 38,40 on both sides of the projections 42.
  • the specific gravity will be of a low value. If the liquid level is at the proper height, a dark viewing pattern will be seen at the viewing surface 16. When the ball goes to the dotted position 44 shown below the tip 46 of the conical surface 14, a dark pattern will no longer be seen at the viewing surface 16 since the ball will not be invisible to the viewer. This indicates that the liquid level and the specific gravity are both satisfactory.
  • the battery cap 52 of FIGS. 1 and 2 is formed of a general typical construction and has an outer portion 54 and an inner portion 56 which has a lower section of a slightly reduced thickness 58.
  • the indicator rod 10 is surrounded by a relatively large diameter rim 60, which may be integrally formed on the rod that engages the shoulder 62 of the inner portion 56 so as to support the cap and to form a seal between the inner periphery of the inner portion 56 and the rim 60.
  • a gas passageway 64 is provided in the rim.
  • a second rim 66 of a smaller diameter which again may be integrally formed with the rod or separately secured thereto, that has an outwardly projecting baffle 68 which is disposed over the gas passageway 64 in the rim 66.
  • the cap 52 has a resilient downwardly projecting lip 70 which is deflected inwardly when the cap is inserted on the rod 10 so that it forms a seal against the upper surface 72 of the rim 66.
  • Located above the lip 70 is a groove 76 which is formed in the rod just below the viewing surface 16
  • the inner wall 74 of the cap 52 has a projecting rib 78 which fits into the groove 76 so as to lock the battery cap 52 in place on the rod 10.
  • the porous flame barrier filter 80 is secured into place in the assembly by pressing it down into the upper part of the elongated aperture 82 to the point where the shoulders 84,86 cause a narrowing of the width of the aperture 82 so that the shoulders 84, 86 receive the bottom surface 88 of the filter 80.
  • the cap has a pair of ribs 94,96 integral with the cap 52 which project into the resilient filter 80 in order to secure it firmly in place in the cap 52. In this manner, the natural resiliency of the filter 80 takes effect so that the ribs 94,96 are pressed tightly into the filter 80 when the cap 52 is forced downward in the opening 82 to the position shown in FIG. 2.
  • the porous flame barrier filter 80 is preferably formed of a material that has a low heat conductivity. Then if a flame is ignited outside of the battery over the filter 80, conduction of heat to the cap 52 will be retarded in the hope that the flame can be put out before the cap is destroyed.
  • the filter 80 is preferably formed of polyvinyl fluoride with a porosity in the range of 200 microns or less.
  • a liquid level indicator having an elongated rod of light transmitting material having an upper viewing surface and a lower reflecting surface, a cap having a through bore adapted to accept the upper end of said rod, an annular chamber in said cap which is spaced from and surrounds the bore and the rod, said chamber being open at its upper end to ambient conditions and at its lower closed end being provided with at least one port which is in communication with the interior of the container being monitored, a porous flame barrier filter positioned within and closing the upper open end of said chamber, said rod further having a relatively large diameter laterally extending rim around said rod and in engagement with the peripheral inner cap wall forming the lower portion of the bore of said cap and having at least one point of discontinuity at the juncture of said rim and said wall, and a relatively small diameter rim around said rod which is positioned above said large diameter rim and spaced from said wall, a resilient sealing lip positioned within said bore of said cap and adapted to engage said smaller diameter rim to seal the bore within which said rod is positioned, said large diameter rim
  • a liquid level indicator of the type claimed in claim 5 wherein the lower reflecting surface of said rod is positioned within and carries a hydrometer cage including at least one ball having a predetermined specific gravity which is visible through said rod under predetermined conditions.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)
  • Closures For Containers (AREA)
US452081A 1974-03-18 1974-03-18 Liquid indicator for a storage battery with a flame barrier vent filter Expired - Lifetime US3915753A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US452081A US3915753A (en) 1974-03-18 1974-03-18 Liquid indicator for a storage battery with a flame barrier vent filter
CA221,760A CA1033227A (en) 1974-03-18 1975-03-11 Cap assembly for a storage battery including a liquid level indicator and a flame barrier vent filter
IT21272/75A IT1034283B (it) 1974-03-18 1975-03-14 Indicatore di livello per una bat teria con filtro di sfiato para fiamma
DE2511426A DE2511426C2 (de) 1974-03-18 1975-03-15 Flüssigkeitsanzeiger
FR7508296A FR2265070B3 (de) 1974-03-18 1975-03-17
SE7502970A SE410540B (sv) 1974-03-18 1975-03-17 Vetskenivaindikator med ventilationsanordning
JP50031930A JPS5818608B2 (ja) 1974-03-18 1975-03-18 蓄電池用キヤツプ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452081A US3915753A (en) 1974-03-18 1974-03-18 Liquid indicator for a storage battery with a flame barrier vent filter

Publications (1)

Publication Number Publication Date
US3915753A true US3915753A (en) 1975-10-28

Family

ID=23794944

Family Applications (1)

Application Number Title Priority Date Filing Date
US452081A Expired - Lifetime US3915753A (en) 1974-03-18 1974-03-18 Liquid indicator for a storage battery with a flame barrier vent filter

Country Status (7)

Country Link
US (1) US3915753A (de)
JP (1) JPS5818608B2 (de)
CA (1) CA1033227A (de)
DE (1) DE2511426C2 (de)
FR (1) FR2265070B3 (de)
IT (1) IT1034283B (de)
SE (1) SE410540B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074025A (en) * 1976-03-29 1978-02-14 Miyagawa Kasei Industry Co., Ltd. Indicating device for storage battery
US4240282A (en) * 1979-09-27 1980-12-23 Illinois Tool Works Inc. Combined level indicator and hydrometer
US4462249A (en) * 1981-03-13 1984-07-31 Adams Thomas E Tank leakage detection method
US4539270A (en) * 1983-12-20 1985-09-03 Santiago Mejia Battery cap indicator with levered float
US4562127A (en) * 1984-03-29 1985-12-31 Domingo Mangone Battery cap with electrolyte level indicator
US4587923A (en) * 1983-08-12 1986-05-13 Santiago Mejia Battery cap indicator
US5132176A (en) * 1990-05-03 1992-07-21 Gnb Industrial Battery Company Battery state of charge indicator
US5284720A (en) * 1993-05-27 1994-02-08 Globe-Union Inc. Vent cap with electrolyte drain and explosion attenuation capabilities
US5549986A (en) * 1994-06-15 1996-08-27 Globe-Union, Inc. Battery cover and manifold system providing spew resistance and explosion attenuation capabilities
US5702841A (en) * 1995-07-19 1997-12-30 Globe-Union Inc. Electrolyte venting system with tubular splash guards
US6393910B1 (en) 2000-01-25 2002-05-28 Illinois Tool Works Inc. One-piece battery charge indicator cage
US20020064705A1 (en) * 2000-11-29 2002-05-30 Wilhelm Cramer Vent plug system for storage batteries
EP1369952A2 (de) * 2002-06-03 2003-12-10 VB Autobatterie GmbH Ladezustandsanzeiger für eine Batterie
US20060234114A1 (en) * 2005-04-15 2006-10-19 Vb Autobatterie Gmbh & Co. Kgaa Rechargeable battery
US20170162919A1 (en) * 2015-12-04 2017-06-08 Doyle Manufacturing, Inc. Electrolyte level gauge

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114234U (de) * 1976-02-27 1977-08-30
JPS52114233U (de) * 1976-02-27 1977-08-30
JPS5619810Y2 (de) * 1976-03-29 1981-05-11
JPS5619809Y2 (de) * 1976-03-29 1981-05-11
JPS5619812Y2 (de) * 1976-03-31 1981-05-11
JPS5619811Y2 (de) * 1976-03-29 1981-05-11
JPS52133925U (de) * 1976-03-31 1977-10-12
JPS52133924U (de) * 1976-03-31 1977-10-12
JPS5619813Y2 (de) * 1976-03-31 1981-05-11
JPS52155928U (de) * 1976-05-20 1977-11-26
DE3038432A1 (de) * 1980-10-11 1982-07-22 Illinois Tool Works Inc., 60631 Chicago, Ill. Fluessigkeitsstandindikator und hydrometer
DE3232056A1 (de) * 1982-08-28 1984-03-01 CEAG Licht- und Stromversorgungstechnik GmbH, 4600 Dortmund Batteriegehaeuse
DE102006024798B3 (de) * 2006-05-27 2007-03-22 Vb Autobatterie Gmbh & Co. Kgaa Ladezustandsanzeiger

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033911A (en) * 1958-07-30 1962-05-08 Electric Storage Battery Co Vent plug
US3319597A (en) * 1966-04-20 1967-05-16 Richardson Co Liquid level indicator
US3383917A (en) * 1965-12-08 1968-05-21 Illinois Tool Works Liquid level indicator
US3490954A (en) * 1966-05-23 1970-01-20 Bell Telephone Labor Inc Lead-acid cell
US3507708A (en) * 1966-09-22 1970-04-21 Wonder Piles Electric cell with gas permeable vent stopper
US3597973A (en) * 1969-09-08 1971-08-10 Illinois Tool Works Combined level indicator and hydrometer
US3708347A (en) * 1969-08-12 1973-01-02 Bosch Gmbh Robert Device for replenishing the liquid in a storage battery

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1095499A (de) *
US2471585A (en) * 1946-03-09 1949-05-31 C & D Batteries Inc Explosion-proof battery vent and filler plug
BE523578A (de) * 1952-10-16
FR1086070A (fr) * 1953-07-03 1955-02-09 Comp Generale Electricite Bouchon pare-électrolyte et anti-déflagrant pour accumulateur électrique
US2858354A (en) * 1955-06-10 1958-10-28 Gould National Batteries Inc Combustion-proof battery vent
US3379576A (en) * 1965-07-21 1968-04-23 Gen Motors Corp Electrolyte level indicator
DE1696559B2 (de) * 1967-10-21 1972-09-14 Wiesauplast Kunststoff- Und Formenbau Gmbh, Wiesau Kg, 8591 Wiesau Pruefeinrichtung fuer den fuellstand eines elektrischen akkumulators
DE1939204A1 (de) * 1969-08-01 1971-02-18 Wiesauplast Kunststoff Und For Pruefeinrichtung fuer den Fuellstand eines Akkumulators
DE6932119U (de) * 1969-08-12 1970-04-16 Bosch Gmbh Robert Vorrichtung fuer die fernanzeige des fluessigkeitsstandes in einem akkumulator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033911A (en) * 1958-07-30 1962-05-08 Electric Storage Battery Co Vent plug
US3383917A (en) * 1965-12-08 1968-05-21 Illinois Tool Works Liquid level indicator
US3319597A (en) * 1966-04-20 1967-05-16 Richardson Co Liquid level indicator
US3490954A (en) * 1966-05-23 1970-01-20 Bell Telephone Labor Inc Lead-acid cell
US3507708A (en) * 1966-09-22 1970-04-21 Wonder Piles Electric cell with gas permeable vent stopper
US3708347A (en) * 1969-08-12 1973-01-02 Bosch Gmbh Robert Device for replenishing the liquid in a storage battery
US3597973A (en) * 1969-09-08 1971-08-10 Illinois Tool Works Combined level indicator and hydrometer

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074025A (en) * 1976-03-29 1978-02-14 Miyagawa Kasei Industry Co., Ltd. Indicating device for storage battery
US4240282A (en) * 1979-09-27 1980-12-23 Illinois Tool Works Inc. Combined level indicator and hydrometer
US4462249A (en) * 1981-03-13 1984-07-31 Adams Thomas E Tank leakage detection method
US4587923A (en) * 1983-08-12 1986-05-13 Santiago Mejia Battery cap indicator
US4539270A (en) * 1983-12-20 1985-09-03 Santiago Mejia Battery cap indicator with levered float
US4562127A (en) * 1984-03-29 1985-12-31 Domingo Mangone Battery cap with electrolyte level indicator
US5132176A (en) * 1990-05-03 1992-07-21 Gnb Industrial Battery Company Battery state of charge indicator
US5284720A (en) * 1993-05-27 1994-02-08 Globe-Union Inc. Vent cap with electrolyte drain and explosion attenuation capabilities
US5549986A (en) * 1994-06-15 1996-08-27 Globe-Union, Inc. Battery cover and manifold system providing spew resistance and explosion attenuation capabilities
US5702841A (en) * 1995-07-19 1997-12-30 Globe-Union Inc. Electrolyte venting system with tubular splash guards
US6393910B1 (en) 2000-01-25 2002-05-28 Illinois Tool Works Inc. One-piece battery charge indicator cage
US20020064705A1 (en) * 2000-11-29 2002-05-30 Wilhelm Cramer Vent plug system for storage batteries
US6844104B2 (en) 2000-11-29 2005-01-18 Accumulatorenwerke Hoppecke Carl Zoellner & Sohn Gmbh & Co. Kg Vent plug system for storage batteries
EP1369952A2 (de) * 2002-06-03 2003-12-10 VB Autobatterie GmbH Ladezustandsanzeiger für eine Batterie
EP1369952A3 (de) * 2002-06-03 2005-12-28 VB Autobatterie GmbH Ladezustandsanzeiger für eine Batterie
US20060234114A1 (en) * 2005-04-15 2006-10-19 Vb Autobatterie Gmbh & Co. Kgaa Rechargeable battery
US7981534B2 (en) 2005-04-15 2011-07-19 Vb Autobatterie Gmbh & Co. Kgaa Rechargeable battery with flexibly connected vent plugs
US20170162919A1 (en) * 2015-12-04 2017-06-08 Doyle Manufacturing, Inc. Electrolyte level gauge
US10361468B2 (en) * 2015-12-04 2019-07-23 Doyle Manufacturing, Inc. Electrolyte level gauge
US10615466B2 (en) * 2015-12-04 2020-04-07 Doyle Manufacturing, Inc. Electrolyte level gauge

Also Published As

Publication number Publication date
SE7502970L (de) 1975-09-19
DE2511426C2 (de) 1984-11-22
DE2511426A1 (de) 1975-09-25
IT1034283B (it) 1979-09-10
FR2265070B3 (de) 1977-11-25
CA1033227A (en) 1978-06-20
FR2265070A1 (de) 1975-10-17
SE410540B (sv) 1979-10-15
JPS50129064A (de) 1975-10-11
JPS5818608B2 (ja) 1983-04-14

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